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skge: fix occasional BUG during MTU change 

The BUG_ON(skge->tx_ring.to_use != skge->tx_ring.to_clean) in skge_up()
was sometimes observed when setting MTU.

skge_down() disables the TX queue, but then reenables it by mistake via
skge_tx_clean().
Fix it by moving the waking of the queue from skge_tx_clean() to the
other caller. And to make sure start_xmit is not in progress on another
CPU, skge_down() should call netif_tx_disable().

The bug was reported to me by Jiri Jilek whose Debian system sometimes
failed to boot. He tested the patch and the bug did not happen anymore.

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Acked-by: Stephen Hemminger <shemminger@vyatta.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michal Schmidt 2009-04-14 15:16:55 -07:00 committed by David S. Miller
parent fc59f9a3bf
commit d119b39279
1 changed files with 2 additions and 2 deletions
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4
drivers/net/skge.c
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@ -2674,7 +2674,7 @@ static int skge_down(struct net_device *dev)
if (netif_msg_ifdown(skge)) if (netif_msg_ifdown(skge))
printk(KERN_INFO PFX "%s: disabling interface\n", dev->name); printk(KERN_INFO PFX "%s: disabling interface\n", dev->name);
netif_stop_queue(dev); netif_tx_disable(dev);
if (hw->chip_id == CHIP_ID_GENESIS && hw->phy_type == SK_PHY_XMAC) if (hw->chip_id == CHIP_ID_GENESIS && hw->phy_type == SK_PHY_XMAC)
del_timer_sync(&skge->link_timer); del_timer_sync(&skge->link_timer);
@ -2881,7 +2881,6 @@ static void skge_tx_clean(struct net_device *dev)
} }
skge->tx_ring.to_clean = e; skge->tx_ring.to_clean = e;
netif_wake_queue(dev);
} }
static void skge_tx_timeout(struct net_device *dev) static void skge_tx_timeout(struct net_device *dev)
@ -2893,6 +2892,7 @@ static void skge_tx_timeout(struct net_device *dev)
skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_STOP); skge_write8(skge->hw, Q_ADDR(txqaddr[skge->port], Q_CSR), CSR_STOP);
skge_tx_clean(dev); skge_tx_clean(dev);
netif_wake_queue(dev);
} }
static int skge_change_mtu(struct net_device *dev, int new_mtu) static int skge_change_mtu(struct net_device *dev, int new_mtu)